Good day,

From magento ce 2.3.4 admin just in configuration module I can not save or saving button is not working:

a) Firefox most of the time not working

B) google chrome sometimes not working

c) Microsoft edge works ok

console says:

"TypeError: d[0] is undefined" related to https://cdn.mysite/pub/static/versionxxxxxx/adminhtml/Magento/backend/en_US/Dotdigitalgroup_Email/js/node_modules/fancybox/jquery.fancybox.pack.min.js

In order to resolve the issue I have tried:

  • fix permissions of folder and files, no luck
  • clear and flush cache, sometimes works
  • deploy the site, sometimes works

anyone has a solution or experiences the same issue?

at the same time, I am using, nginx, varnish apache and pagespeed.

  • do you check the console log for errors? Commented Mar 23, 2020 at 19:15

1 Answer 1


Make sure that you have following folder in your Magento installation


I faced similar issue in my local setup, the folder was present on Windows but missing in the Virtual Box folder. After uploading it to VirtualBox the issues was fixed.

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